I have just seen this movie.
Finding a cart that would balance my new AI2 as I have the same problem as you re strength.
The C-Tug is good for everything except a large, heavily laden boat on very soft sand.
About the same price I highly recommend these quality carts which use the same Wheelez wheels as Hobie beach carts do, and they roll over everything, they are not easy to puncture, and if so can be melt-repaired.
http://www.wheeleez.com/canoe-kayak-carts.phpBut it gets better, the cart will fold into you're front hatch and not get fouled in yerr sail's Main Sheet like the plugin TRAX2 does when upside-plugged or it saves Two extra walkies back to the car to stash the cart.
Can be floated in/out under the boat when in 18" of water and then you just walk out.
Pushing rather than Pulling you're Cradled boat around when on flat ground, if possible, is much better for you're back and this can be done when the boat is balanced on easy-rolling wheels.
https://www.youtube.com/watch?v=yOIvWCHZNWEI think the Mini model would suit you're Outback unless you have some really big rocks to drag over.